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Maor, Eli; Jost, Eugen (2014), "46 The Reuleaux Triangle", Beautiful Geometry, Princeton University Press, ss. 154-156, ISBN978-1-4008-4833-1, 12 Nisan 2016 tarihinde kaynağından arşivlendi, erişim tarihi: 30 Aralık 2020.
Euler, Leonhard (1781), "De curvis triangularibus", Acta Academiae Scientiarum Imperialis Petropolitanae (Latince), cilt 1778, ss. 3-30, 17 Ocak 2020 tarihinde kaynağından arşivlendi, erişim tarihi: 30 Aralık 2020. Orbiformların tanımları için özellikle sayfa 7'ye bakın.
Granovsky, V. A.; Siraya, T. N., "Metrological traceability and quality of industrial tests measurements", Pavese, F.; Bär, M.; Filtz, J.-R.; Forbes, A. B.; Pendrill, L.; Shirono, K. (Ed.), Advanced Mathematical and Computational Tools in Metrology and Testing IX, World Scientific, ss. 194-201. Özellikle bkz. s. 200 10 Haziran 2016 tarihinde Wayback Machine sitesinde arşivlendi..
Burchett, E. S. (1876), "Caption to Plate LV, Fig. 6", Practical plane geometry, Londra ve Glasgow: William Collins, Sons, and Co., 20 Mayıs 2016 tarihinde kaynağından arşivlendi, erişim tarihi: 30 Aralık 2020.
Frankl, Paul; Crossley, Paul (2000), Gothic Architecture, Pelican history of art, 19, Yale University Press, s. 146, ISBN978-0-300-08799-4, 11 Mayıs 2016 tarihinde kaynağından arşivlendi, erişim tarihi: 30 Aralık 2020.
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